My rogue:
424 agi = 10.31% crit
424/10.31= 41.13 agi per crit
427 agi = 10.38% crit
427/10.38 = 41.14 agi per crit
However:
Unequipping my ranged weapon
[Mama's Insurance] with 10 agility, my crit rate decreased by 0.25%.
417 agi = 10.13% crit
471/10.13 = 41.16
If 10 agility is 0.25% crit chance, then:
1/(0.25/10)= 40 agility per crit
So, given the not so detailed character sheet, it is around 40-41 agility per crit.
For dodge, this 10 agility means a difference of exactly 0.5% dodge.
So it is quite safe to assume that rogues need 20 agility for 1% dodge.